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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include <private/chartdatetimeaxisx_p.h>
#include <private/chartpresenter_p.h>
#include <QtCharts/QDateTimeAxis>
#include <private/abstractchartlayout_p.h>
#include <QtWidgets/QGraphicsLayout>
#include <QtCore/QDateTime>
#include <QtCore/QtMath>
QT_BEGIN_NAMESPACE
ChartDateTimeAxisX::ChartDateTimeAxisX(QDateTimeAxis *axis, QGraphicsItem *item)
: HorizontalAxis(axis, item),
m_axis(axis)
{
QObject::connect(m_axis, SIGNAL(tickCountChanged(int)), this, SLOT(handleTickCountChanged(int)));
QObject::connect(m_axis, SIGNAL(formatChanged(QString)), this, SLOT(handleFormatChanged(QString)));
}
ChartDateTimeAxisX::~ChartDateTimeAxisX()
{
}
QList<qreal> ChartDateTimeAxisX::calculateLayout() const
{
int tickCount = m_axis->tickCount();
Q_ASSERT(tickCount >= 2);
QList<qreal> points;
points.resize(tickCount);
const QRectF &gridRect = gridGeometry();
const qreal deltaX = gridRect.width() / (qreal(tickCount) - 1.0);
for (int i = 0; i < tickCount; ++i)
points[i] = qreal(i) * deltaX + gridRect.left();
return points;
}
void ChartDateTimeAxisX::updateGeometry()
{
const QList<qreal> &layout = ChartAxisElement::layout();
if (layout.isEmpty())
return;
setLabels(createDateTimeLabels(min(), max(), layout.size(), m_axis->format()));
HorizontalAxis::updateGeometry();
updateLabelsDateTimes();
}
void ChartDateTimeAxisX::handleTickCountChanged(int tick)
{
Q_UNUSED(tick);
QGraphicsLayoutItem::updateGeometry();
if (presenter())
presenter()->layout()->invalidate();
}
void ChartDateTimeAxisX::handleFormatChanged(const QString &format)
{
Q_UNUSED(format);
QGraphicsLayoutItem::updateGeometry();
if (presenter())
presenter()->layout()->invalidate();
}
QSizeF ChartDateTimeAxisX::sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
Q_UNUSED(constraint);
QSizeF sh;
QSizeF base = HorizontalAxis::sizeHint(which, constraint);
const QStringList ticksList =
createDateTimeLabels(min(), max(), m_axis->tickCount(), m_axis->format());
// Width of horizontal axis sizeHint indicates the maximum distance labels can extend past
// first and last ticks. Base width is irrelevant.
qreal width = 0;
qreal height = 0;
if (ticksList.empty())
return sh;
switch (which) {
case Qt::MinimumSize: {
if (labelsVisible()) {
QRectF boundingRect = ChartPresenter::textBoundingRect(axis()->labelsFont(),
QStringLiteral("..."),
axis()->labelsAngle());
width = boundingRect.width() / 2.0;
height = boundingRect.height() + labelPadding() + base.height() + 1.0;
} else {
width = 0;
height = base.height() + 1.0;
}
sh = QSizeF(width, height);
break;
}
case Qt::PreferredSize: {
if (labelsVisible()) {
qreal labelHeight = 0.0;
qreal firstWidth = -1.0;
for (const QString &s : ticksList) {
QRectF rect = ChartPresenter::textBoundingRect(axis()->labelsFont(), s, axis()->labelsAngle());
labelHeight = qMax(rect.height(), labelHeight);
width = rect.width();
if (firstWidth < 0.0)
firstWidth = width;
}
height = labelHeight + labelPadding() + base.height() + 1.0;
width = qMax(width, firstWidth) / 2.0;
} else {
height = base.height() + 1.0;
width = 0;
}
sh = QSizeF(width, height);
break;
}
default:
break;
}
return sh;
}
QT_END_NAMESPACE
#include "moc_chartdatetimeaxisx_p.cpp"
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